Dual Nature Of Light Question 332

Question: If the threshold wavelength for sodium is 5420 Å, then the work function of sodium is [RPMT 2003]

Options:

A) 4.58 eV

B) 2.28 eV

C) 1.14 eV

D) 0.23 eV

Show Answer

Answer:

Correct Answer: B

Solution:

$ W_{0}=\frac{12375}{{\lambda_{0}}}=\frac{12375}{5420}=2.28,eV $